Exercise mat



FIG. 1 is a top elevation view of an exercise mat showing a new design;

FIG. 2 is a top side plan view thereof;

FIG. 3 is a bottom side plan view thereof;

FIG. 4 is a right side plan view thereof;

FIG. 5 is a left side plan thereof;

FIG. 6 is a front side plan view thereof; and,

FIG. 7 is a back side plan view thereof. 

What is claimed is the ornamental design for an exercise mat, as shown and described. 